Hoisting-machine.



H. G. JOHNSTON. HOISTING MACHINE.

APPLIUATION -FILED JAN. 23, 1911.

2 SHEETS-SHEET l.

- JuzvimssA I I I (M@ y H. G. JOHNSTON.

HOISTING MACHINE..

APPLIGATION FILED JAN. 23. 1911 Patented May 21, 1912.

mnentors 2 SHEETS-SHEET 2.

JS/m s Bl* Chim-usgs UNITED STATES PATENT OFFICE.

HOEAOE G. JOHNSTON, OE oons'mANA,y rExAS, ASSIGNOE 'ro -AmEmcAN WELL a vinosrEerINe. COMPANY, 1Nc., or' coasIcANA, rExAS, A conroaATIoNoE TEXAS.

HOISTING-MACHINE.

specification of Letters Patent.

Patented May 21, 1912.

Application led January 23, 1911. Serial No. 604,169.

To all 'whom 'it may concern:

`Be it known that I, HORACE G. JOHNSTON,

a` citizen of the United States, residing at Corsicana, in the county of yNavarra and State of Texas, have invented certain new and useful Improvements in Hoisting-Machines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to improvements in hoisting machines, and particularly to the construction and arrangement-of drums and controlling devices for the brakes thereof.

The obj ect in view is the arrangement of improved means for causing the brakes of hoisting drums to grip the drum.y

A further object of the invention is the arrangement of improved means for adjusting the actionfof the brakes of a hoisting drum 1n order to take up the wear of the machine.

With these and other Objects in view the invention comprises certain novel constructions, comblnatlons, and arrangement of parts as will be hereinafter more fully de` scribed and claimed.

fulcrum spools.

In the accompanying drawings: Figure l is a longitudinal vertical section through an embodiment of the invention. Fig. 2 is a section through Fig. 1 on line 2-2. v Fig. '3 is a detail fragmentary view of the controlling lever and associated structures. Fig. 4 is a fragmentary rear view of the controlling lever, counter-balancing weight, and associated parts, the same bein shown on a reduced scale to that shown in Fig. 8. Fig. 5 is an edge view of the clutch shifting lever. Fig. 6 is a fragmentary sectional View on line 64-6 of Fig. 4. Fig. 7 is'a detail fragmentary perspective view of one end of the controlling lever.

In forming a device embodying the invention a drum is provided formed with braking flanges, preferably at each end. Arranged on these braking iianges are flexible brake bands which are connected to suitable These'fulcrum spools are in turn connected to a shaft so that both` spools will act together` upon the Operationof a single leverassociated with one of they-spools. Thls spool is provided with ratchet. teeth- .on part of its periphery which co-act with a toothed lug on the lever forcausing powerl sired, but an extreme movement of the .respective sprockets.

to be transmitted from the lever to the fulcrum, and also for permitting the lever to be adjusted in respect 'tothejfulcrum in order to compensate for the wear on the brake band and the brakeshoe.

same is shown in the accompanying drawings, in whichl indicates a framework of any desired kind braced in any desired manner for supporting the various operating and moving parts of the drum and associated structures. Arranged on framework 1 are bearings 2- and 3 which support a drum shaft 4. On shaft 4 is mounted a drum 5, sprocket wheels- 6 and`7, and sliding clutch members 8 and 9. The clutch members 8 and 9 engage clutch structures 10 and 11 rigidly secured to sprocket wheels 6 and 7 respectively. The clutch composed of members 9 and 11 is of the cone-type, While the clutch structure associated with wheel 6 is of a different type. It will be' evident that both' clutches may be of` the cone-type if desired. The clutches are arranged so that when one is thrown out of engagementthe other clutch will be thrown into engagement, but may be adjusted so that the drum may rotate freely if declutches will either throw the same positively into operation or entirely out of Operation. The clutch members 8 :and 9 are slidingly mounted or splined to shaft 4,- while the sprocket Wheels 6 and 7 areloosely mounted 90 on the shaft so as to freely4 rotate thereon, unless connected to the shaft through the The. drum.- 5 is also secured to the shaft 4, preferably by being keyed thereto so as to be positively rotated whenever shaft 4 is rotated. Sprocket wheel 6 is considerably larger' than sprocket wheel 12 mounted on power shaft 13, so that sprocket wheel 12 will rotate several times while sprocket Wheel 6 isv rotating once, a suitable chain 14 being provided for communicating power from one sprocket wheel to the other. The sprocket wheels 7 and .15 are preferably of the same size, so that when the clutch formed of members 9 and 11 is in. operation the drum will rotate at the Vsame speed as the power shaft 13 as sprocket 15 is rigidly secured to shaft13, and is connected with sprocket wheel 7 by a suitable chain 16.

The shaft 13 may receive power. from any,v 110 In order that the invention may be more 7 clearly understood an embodiment of the wil .suitable source, not shown', the power being .sprocket wheels are secured. When it is desired to disengage the clutch portion 8 and engage clutch portion 9 the clutch control lin ever 19 is moved in one direction which cause movement to be` transmitted through connecting rod 2O to lever 21 which is pvotally mounted at 22 on a suitable bracket. Lever 21 is connected with the clutch member or portion 9so that the clutch is easily thrown into and out of operation by a suitable movement of lever 19 which is amework 1. A

Drum -5 is formed with end members 25 and 26 which are formed with hubs and which are rigidly keyed to shaft. 4. A plurality of retaining bolts 27 arel provided for holding the end members 25 and 26 from separating, while a central drum or tubular portion 28 is provided for holding the end members spaced apart, and for acting as the center or core of the drum 5. Tlie end. members 25 and 26 are formed with annular notched out portions 29 and 30 for receiving the annular friction flanges 31 and 32 which are bolted or riveted to the end members in such a manner as to be easily removed whenever new ones are desired. The notches 29 and 30 are made of sufiicient depth, and the friction flanges 31 and 32 are made sufficiently' small for permitting the end members 25 and 26 to project above flanges 31 and 32 which will assist in holding the friction bands 33 and 34 in position. The friction bands are made of identical structure so that the description of'one will apply to the other. In Fig. 2 it will be seen thatA the friction band 33 is formed in two parts, namely parts 35 and 36, which have turnedup portions 37 and 38 connected by a tensionA bolt 39 for prop erly adjusting the parts'of the friction ban'd to the friction flange 31. Friction flange 31 is preferablymade from open hearth steel castings, while the members 35 and 36 are made of flexible metal having secured thereto blocks of wood 40 which engage the friction flange 31, and' which may be easilyvrel newed from time t'o time without renewing the'metallic parts 35 and 36. The end of r` 351e pin 41 part 35 opposite extension 37 is bent around Fig. 3 rigidly secured to a ful! crum spoo v42 w ich in turn is rigidly secured to shaft 43. Shaft 43 extends suiciently far across the framework 1 to be journaled in some of the uprights thereof,

and to permit the connection of the bar.

with both of the friction bands or brakes 33 and 34. It will be understood that a fulcrum spool 42 is provided for each of the brake bands 33 and 34, though the fulcrum spool 42 at brake band 34 need not have the y pivoted at 23 to a suitable support secured to notches or teeth 44 unless it is desired'to apply a controlling arm at that end. Prefera y a brake band controlling lever 45 is pivotally mounted on shaft 43 so as to have the notched lug or extension 46 secured thereto to engage the notches 44 of the fulcrum spool 42 positioned in proximity to the friction band 33. Extension'46 is providedso that Whenever the friction members or shoes 40 become worn and it isgnot desired to tighten up tension bolt 39, member 46 may be removed by taking out the securing members 46 and lever 45 raised to the position shown in Fig. 2, while the parts 35 and 36 are held tight manually, and then the extension '46 replaced. This will accommodate any ordinary wear, and in fact permit the use of the members .40 until the same have practically been worn out. The fulcrum spool 42 is provided with a hub structure 47 around which a band 48 is passed Aand to which is bolted or riveted the art 36 of brake band 33.

en it is desired to cause the' brake bands 33 and 34:` to engage the flanges 31 and 32 lever 45 is depressed which will twist or turn turn partially the fulcrum spools 42 which will pull upon the ends of the brake bands and cause the same to frictionally engage the flanges 31 and 32.. When the lever 45 is released ordinarily the brake bands will automatically release themselves, but if for partially shaft 43, and also will c any reason they should stick .the same are Y positively released Aby the action of weight 49 which is pivotally mounted upon a lever 50 which lever is rigidly secured by any desired means to shaft 43. It will,of course, be evident that weight\49 may be made of any desired size and weight, so as to operate properly but not require any considerable power for lifting the same when the lever 45 is depressed, the same being preferably arranged in such a way as to slightly more than counter-balance the lever 45 and associated par-ts for bringing the same back to their normal released position, but not substantially resisting any movement of the lever 45. p

What I claim is:

1. In a hoisting mechanism, ap'rotating4 hoistin drum, means to rotate the drum, brake ands encircling the drum two places, a shaft journaled adjacent the periphery of the drum, means carried by said a shaft spaced therefrom, vfulcrum spoolsl said spool.

shaft, :brake drums arranged thereon, and adapted to engage the serrated edge vof 10 carried by said spaced shaft, brake bands -In testimony whereof I aiix my signature carried by said spools and adapted to pass in presence of two witnesses.

about said brake drums, one of the flanges HORACE' Gr. JOHNSTON. of one of said spools having a serra'fed edge, Witnesses: a lever carried-by said spaced shaft, and a W. J. HALL,

serrated lug removably carried on said lever M. WESTMORELA'ND. 

